Robert Downey Jr. hasn't signed for another Marvel movie and has even stated his interest in leaving, making a fourth standalone film quite hard to consider.
Downey Jr. also confirmed Paltrow's return by sharing on his Instagram account a picture of him with his on-screen love interest as well as Favreau, who plays Tony's chauffeur and personal assistant Happy Hogan, on the set.
The Marvel universe has a lot of content ahead, with "Avengers: Infinity War" hitting next year, followed by "Avengers 4" in 2019 - making the schedule super tight and combining character storylines with all the MCU coming together in one film. He captioned it with "Infinity Trinity ..."
Brand new photos from the set of Avengers 4 have emerged online.
And to see who else will be showing up in the Avengers sequel, check out the gallery below to see every Avengers: Infinity War character confirmed so far. However, following her surprise cameo in Spider-Man: Homecoming, fans have been wondering whether Tony Stark's (Robert Downey Jr.) significant other would make more appearances in Marvel's upcoming adventures.
But the two A-listers have set the record straight and given away a massive spoiler to the film, revealing that Pepper Potts and Tony Stark (Iron Man) are engaged.
Avengers 4 boasts a long list of Marvel actors, including Scarlett Johansson, Chris Evans, Chris Hemsworth, Tom Hiddleston, Josh Brolin, Chris Pratt, Elizabeth Olsen, Paul Bettany, Tom Holland, Zoe Saldana, Benedict Cumberbatch, Evangeline Lilly, Karen Gillan, Anthony Mackie and Jeremy Renner. Avengers 4 premieres on May 3, 2019.
Nearly a decade's worth of superheroism and fan-pleasing comic book adaptations have been building up to Avengers: Infinity War, and when it finally hits, the Marvel Cinematic Universe won't be the same as before.